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Derivative Financial Instruments - Credit Derivatives Sold (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Credit derivatives sold disclosures |  |
Notional amount | $ 470.0 |
Fair value | 17.4 |
Maximum future payments | $ 470.0 |
Weighted average expected life | 15 years 10 months 24 days |
Single name credit default swaps |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 220.0 | $ 220.0
Fair value | 3.9 | 4.5
Maximum future payments | $ 220.0 | $ 220.0
Weighted average expected life | 1 year 8 months 12 days | 2 years 8 months 12 days
Single name credit default swaps | Corporate debt securities | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 40.0 | $ 40.0
Fair value | 0.2 | 0.3
Maximum future payments | $ 40.0 | $ 40.0
Weighted average expected life | 6 months | 1 year 6 months
Single name credit default swaps | Corporate debt securities | BBB |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 160.0 | $ 140.0
Fair value | 3.6 | 3.8
Maximum future payments | $ 160.0 | $ 140.0
Weighted average expected life | 2 years 1 month 6 days | 3 years
Single name credit default swaps | Corporate debt securities | BB |  |
Credit derivatives sold disclosures |  |
Notional amount |  | $ 20.0
Fair value |  | 0.2
Maximum future payments |  | $ 20.0
Weighted average expected life |  | 3 years 6 months
Single name credit default swaps | Sovereign | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 20.0 | $ 20.0
Fair value | 0.1 | 0.2
Maximum future payments | $ 20.0 | $ 20.0
Weighted average expected life | 6 months | 1 year 6 months
Single name total return swaps |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 250.0 |
Fair value | 13.5 |
Maximum future payments | $ 250.0 |
Weighted average expected life | 28 years 6 months |
Single name total return swaps | Government/municipalities | AAA |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 40.0 |
Fair value | 2.3 |
Maximum future payments | $ 40.0 |
Weighted average expected life | 30 years 7 months 6 days |
Single name total return swaps | Government/municipalities | AA |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 130.0 |
Fair value | 6.4 |
Maximum future payments | $ 130.0 |
Weighted average expected life | 26 years 6 months |
Single name total return swaps | Government/municipalities | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 80.0 |
Fair value | 4.8 |
Maximum future payments | $ 80.0 |
Weighted average expected life | 30 years 8 months 12 days |

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- Definition Discloses the notional amount of the credit derivatives sold (or each group of similar credit derivatives) as of the date of the statement of financial position. + References No definition available. + Details
Name: | pfg_CreditDerivativeSoldNotional
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Discloses the fair value of the credit derivatives sold (or each group of similar credit derivatives) as of the date of the statement of financial position. + References No definition available. + Details
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Balance Type: | credit
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- Definition Represents the weighted-average expected life in years for credit derivatives sold. + References No definition available. + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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